Nothing since a radio telescope isn't a fucking speaker.

the THX intro sound

Darude - sandstorm

The 1989 Belgian techno anthem Pump Up the Jam.

There is absolutely only one choice, no need to even think about it it's this.

Darude, Sandstorm

You guys remember this?

Pump Up The Jam by Technotronic

Let S be an endless string which is a concatenation of every binary counting in succession, starting from zero all the way to infinity (without left zero-padding):

S = 01101110010111011110001001101010111100110111101111...
(from concatenating 0, 1, 10, 11, 100, 101, 110, 111, 1000, 1001, and so far)

Let S' be a set of every sequential group of octets (8 bits) from string S, which can be represented as a base-10 number (between 0 and 255), like so:

S'_2 = [01101110, 01011101, 11100010, 01101010, 11110011, 01111011, ...]
S'_10 = [110, 93, 226, 106, 243, 123, ...]

I'd create an audio wave file whose samples are each octet from S'_10 as 8-bit audio samples, using a really low sampling rate (such as 8000 Hz or even 4000 Hz).
That sound, that particular sound, is what I'd transmit to the cosmos: the binary counting, something with a detectable pattern (although it'd be not so easily recognizable, but something that one could readily distinguish from randomness noise).

"Come here! I will help you conquer this world. Our civilization is no longer capable of solving its own problems. We need your force to intervene."

(Not really, but...)

Prodigy - Diesel Power

Or maybe the brown note. If it was ever going to work it'd be through this.

Either Never Gonna Give You Up or Darude - Sandstorm

-The internet (10-15 years ago)

The brown note.

4′33″

Baby Shark

CBAT. Get the rest of the galaxy in the mood.

Never gonna give you up

baby shark obv

Imperial march

Video killed the radio star

Answer in title, unrelated Belgian techno anthem.

Video Killed the Radio (Telescope) Star.

Bullug Gegbug Ibgabiug Gixcure Dagabciea Fuic by Keygen Church because the universe deserves to hear the gospel. Praise the code. https://m.youtube.com/watch?v=iJtVDEx2HSk

free bird solo 🤙

Cotton eye joe

Ram Ranch.

Seven Nations Army

Supernaut

A cover of Black Sabbath's "Supernaut", by Al Jourgensen of Ministry's side-project 1000 Homo DJs with vocals by Nine Inch Nails vocalist Trent Reznor.

Ready to die by Andrew W.K. The song ending with “You just heard earth music. This was a warning.”

numa numa all day long

So What'cha Want by the Beastie Boys

Fuck the Pain Away

Megalovania

Goldeneye Surface level PTSD. Enemies beyond your sight horizon due to fog/snow, no map overlay for relative positioning, memorization was the only way to not get lost.

Pink Floyd - Set the Controls for the Heart of the Sun

https://youtu.be/JcfgJrHo9XA

Royalty free Christmas music

https://www.youtube.com/watch?v=oq_wYOGRG7I

I'm really surprised nobody else posted this. My first thought was Goldeneye 64's snow level soundtrack. 😮 Like I could hear it just looking at this image lol.

Sleep now in the fire

Caramelldansen

This

War cant of Mars

https://www.youtube.com/watch?v=wy-sVTaZRPk

Imperial march?

Kirin J Callinan - Big Enough

Y'all are way too nice. I'm pumping a 60Hz square wave right into that thing at max volume.

Sounds of Beast In Black, if power metal was mixed with Abba, of course!

https://youtu.be/f8qWbowzwZU?feature=shared

Because boobs- psychostick

Everybody dance now!

I always want to play Queen on my big speakers

Ok ignoring the fact that this isn't a speaker, if it was and the question is what would I play on a speaker this size, then probably this.

We Interrupt This Programme
(Yeah, I'm oldschool like that)

I could think of a few Ministry tracks, but I'll go with N.W.O.
https://youtu.be/imqvLToWH7k?si=QIw2KiyEcSKGgKmf

I mean, if it WAS a speaker?

The Only Thing They Fear Is You.

"In 2008, RT-70 was used to beam 501 messages at the exoplanet Gliese 581c, in hopes of making contact with extraterrestrial intelligence. The messages should arrive in 2029." - https://en.wikipedia.org/wiki/RT-70?wprov=sfla1

Nice

Drop that bass!

Neovaii - Clean

https://www.youtube.com/watch?v=XMREfRSvPnQ

(Wait for it)

This thing will forever be the Goldeneye dish to me.

"For England James?"

I'm thinking There Is No Planet B by King Gizzard & the Lizard Wizard

Star Wars

It would be funny to broadcast corny 80s dance music to aliens, ngl. Hopefully they don't have that Mars Attack physiology that makes their heads explode to jams.

brown noise

Ghetto Supastar https://open.spotify.com/track/31bf9SEOppLU6lQ85d8om6

Sir mix alot baby's got back.

He's bouncing off my booty cheeks I love the way he rides. I can hardly breathe when he's pumping deep inside.

Bass Cannon by Excision

Because I'd love to see a little bit of Bass Destruction :D

Skrillex - Bangarang

https://youtu.be/YJVmu6yttiw?si=UyE6XIFBeiDNsWKQ

Really gonna hit that 16hz pipe right!

If not me, who? If not now, when?

Gwar - Immortal Corrupter

Thanks for the wiki link, OP. You sent me down a pleasing rabbit hole reading about the large radiotelescopes built by the USSR.

And also, completely tangentially, I have nostalgia for playing the very first Destiny game because the environments were designed with those early USSR Deep Space program aesthetics.

whoomp there it is

Id freak out about having to make a choice and then just blurt out souvlaki space station because it seems like a safe bet of sm i like at high volumes.